**Core Concept**
The patient's presentation of primary amenorrhea, breast and pubic hair development, and a blind vaginal ending with an absent palpable uterus suggests a disorder of sexual development (DSD) or a congenital anomaly affecting the reproductive system. This clinical scenario requires a careful evaluation of the patient's chromosomal, gonadal, and anatomical status.

**Why the Correct Answer is Right**
In this case, the patient's presentation is suggestive of Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome, a congenital anomaly characterized by the absence or underdevelopment of the vagina and uterus, often associated with normal ovarian function and normal secondary sexual characteristics. The presence of normally developed breasts and pubic hair, along with the absence of a palpable uterus, supports this diagnosis. MRKH syndrome is often diagnosed in young women with primary amenorrhea and is typically due to a genetic mutation affecting the development of the Müllerian ducts.

**Why Each Wrong Option is Incorrect**
**Option A:** Androgen Insensitivity Syndrome (AIS) is a disorder of sex development characterized by resistance to androgens, leading to a male phenotype despite the presence of XY chromosomes. This condition would typically present with a more masculine phenotype, including testicular development and a blind-ending vagina.

**Option B:** Congenital Adrenal Hyperplasia (CAH) is a group of genetic disorders affecting the adrenal glands, leading to an excess of androgens. This condition would typically present with virilization of the external genitalia in females, which is not consistent with the patient's presentation.

**Option C:** Swyer Syndrome is a disorder of sex development characterized by the presence of 46,XY chromosomes and a female phenotype. This condition would typically present with a short stature, absent or rudimentary gonads, and a blind-ending vagina.

**Option D:** Turner Syndrome is a genetic disorder affecting females, characterized by a 45,X karyotype and a range of physical and developmental abnormalities. This condition would typically present with short stature, ovarian dysgenesis, and a range of other systemic features.

**Clinical Pearl / High-Yield Fact**
In cases of primary amenorrhea, a careful evaluation of the patient's chromosomal, gonadal, and anatomical status is essential to determine the underlying cause. A thorough physical examination, including a pelvic examination, is crucial in identifying the presence or absence of a uterus and vagina.

**Correct Answer:** C.